Show the changes introduced by a merge.
Use the mktestrepo script to build a test repository. It has tags a, b and merge, which can be used for generating diffs. For example:
$ ./mktestrepo ... test repo is built ... $ hg mergediff -r merge
Additionally, the debuglistmerges command, added by mergediff.py, can be used to list all the merge revisions in a repository. For example:
$ for mergerev in hg debuglistmerges; do > hg mergediff -r $mergerev > done